These utilities are intended to be simple, easily sandboxed, pipeline
components for audio processing, and the `au(7)' file-format is used as
an intermediary because of its simplicity.

Building:
	Automatically build a majority of utilities:
	$ make
	cc -o auconv au.c common.c auconv.c
	...

	Build all possible utilities with some automatic configuration:
	$ make all-magic
	cc -o auconv au.c common.c auconv.c
	...

	Build a specific utility with some automatic configuration:
	$ make auconv-magic
	cc -o auconv au.c common.c auconv.c

	Build a specific utility:
	$ make auconv
	cc -o auconv au.c common.c auconv.c

	Install built utilities to the `PREFIX'
	specified in the `Makefile':
	$ make install
	install -m 444 au.7 /usr/local/man/man7/
	install -m 755 auconv /usr/local/bin/
	install -m 444 auconv.1 /usr/local/man/man1/
	...

	Install built utilities to your `HOME' directory:
	$ make install-local
	install -m 755 auconv /home/user/bin/
	...

Makefile Options:
	PREFIX	- Install-path prefix. (ex. `/usr/local')
	MANDIR	- The man-page sub-directory. (ex. `share/man')

C Macros:
	`USE_CAPSICUM' & `USE_PLEDGE' are automatically added by
	default `make(1)' target, when applicable.

	BSIZE		- The default buffer size.
	USE_CAPSICUM	- Use capsicum(4) for process restriction.
	USE_PLEDGE	- Use OpenBSD pledge(2) for process restriction.
	NAMEMAX		- The maximum size for the program name
			  (used in the buffer in the `SIGINFO' handler)
	CBSIZE		- The size of the command buffer in file2au(1)

	AUOSS_DSP	- The default /dev/dsp* device for auoss(1)
	SDL_BSIZE	- The size of the internal buffer in ausdl(1)

Portability:
	The `Makefile' uses `pkg-config(1)' and `install(1)'.
	`au2flac(1)' and `flag2au(1)' uses `libFLAC'.
	`au2vorbis(1)' and `vorbis2au(1)' uses `libogg', `libvorbis',
	    `libvorbisfile', and `libvorbisenc'.
	`mpg2au(1)' uses `libmpg123'.
	`au2mpg(1)' uses `libmp3lame'.
	`aualsa(1)' uses `libasound'.
	`auaudio(1)' uses `sys/audioio.h'.
	`auoss(1)' uses `sys/soundcand.h' or `libossaudio'.
	`auportaudio(1)' uses `libportaudio'.
	`ausdl(1)' uses `libSDL2'.
	`ausndio(1)' uses `libsndio'.
	`err(3)' and `sysexits(3)' are frequently used.
	`getprogname(3)' and `setprogname(3)' are used.
	When `USE_CAPSICUM' or `USE_PLEDGE' are specified their
	    corresponding interfaces are used.
